Ported 3.6cuft 12" to..4.3cuft 15" worth it?? - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 12 Old 08-06-14, 12:00 AM Thread Starter
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Ported 3.6cuft 12" to..4.3cuft 15" worth it??

I now have 2 -(3.6cuft net Ported subs with RSS315HO.4"x26" port). Both are powered by 1 SA1000 [email protected] ohm total load.

I'm now thinking of building 2- (20x24x24 ,6.67cuft EXTERAL dimensions) not sure of the Net cuft??....using either the RSS390HO or the SI15" powered by inuke amp.

Would the gains be sufficient ?
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post #2 of 12 Old 08-06-14, 06:46 AM
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Re: Ported 3.6cuft 12" to..4.3cuft 15" worth it??

Sufficient?

If you built another pair of the exact same subs you have you would gain 6db across the BW. SO if thats not enough you can use higher excursion drivers and you may gain around 8db more then what you have now. But seeing that your talking about going from 12's to 15's you will gain quite a bit.

As someone else mentioned you could build the Mini Marty also.

"Music is the space between the notes"
[T]o talk well and eloquently is a very great art, but that an equally great one is to know the right moment to stop.
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post #3 of 12 Old 08-06-14, 08:26 AM Thread Starter
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Re: Ported 3.6cuft 12" to..4.3cuft 15" worth it??

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chrapladm wrote: View Post
Sufficient?

If you built another pair of the exact same subs you have you would gain 6db across the BW. SO if thats not enough you can use higher excursion drivers and you may gain around 8db more then what you have now. But seeing that your talking about going from 12's to 15's you will gain quite a bit.

As someone else mentioned you could build the Mini Marty also.
As of now my amp is shutting down on very low hitting scenes when my vol is at -16. The Marty subs are a bit to big for my liking, ...20x24x24 is the biggest i would like to go which gives (6.67 cuft Exterior).

Wondering how low this ^ size box can be tuned with a 15" driver.
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post #4 of 12 Old 08-06-14, 08:40 AM
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Re: Ported 3.6cuft 12" to..4.3cuft 15" worth it??

DO you want to use a slot port, Or passive radiators or round ports?

PR's and slot port would be easiest. PR 's are the easiest but cost more. If tuning low, such as 22hz, you will need a long port length. You will probably end up with something closer to 4cuft after fitting in the port in the enclosure. Then it will be a matter of selecting the correct size to keep velocity of the air down.

Lots of variables but after you select your driver to use then you can go from there.

"Music is the space between the notes"
[T]o talk well and eloquently is a very great art, but that an equally great one is to know the right moment to stop.
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post #5 of 12 Old 08-06-14, 08:56 AM Thread Starter
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Re: Ported 3.6cuft 12" to..4.3cuft 15" worth it??

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chrapladm wrote: View Post
DO you want to use a slot port, Or passive radiators or round ports?

PR's and slot port would be easiest. PR 's are the easiest but cost more. If tuning low, such as 22hz, you will need a long port length. You will probably end up with something closer to 4cuft after fitting in the port in the enclosure. Then it will be a matter of selecting the correct size to keep velocity of the air down.

Lots of variables but after you select your driver to use then you can go from there.
Thanks Chrapladm !!, ...im thinking of using the RSS390HO or the SI15". I would use a Slot Port like the Captivator

which is same 20"W and looks like is only (1.5" high slot height )?. Is 22hz the lowest i can get ?
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post #6 of 12 Old 08-07-14, 09:07 AM
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Re: Ported 3.6cuft 12" to..4.3cuft 15" worth it??

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randyc1 wrote: View Post
As of now my amp is shutting down on very low hitting scenes when my vol is at -16. The Marty subs are a bit to big for my liking, ...20x24x24 is the biggest i would like to go which gives (6.67 cuft Exterior).

Wondering how low this ^ size box can be tuned with a 15" driver.
You could still use the mini marty design, you just will give up a few db. But honestly whats 4" in the scheme of things? The Mini Marty is a 24x24x24 cube. I am building my version downfiring so I am adding 3" to the bottom for legs.

Also you are aware that the 15" Stereo Integrity Drivers are dual 4 ohms, meaning you either need 600 wpc @ 8 ohms, or 600 wpc @ 2 ohms..... The 2 ohm load can be a bit hard for pro amps to drive and finding that much wattage @ 8 ohms is a PITA. Or you would just need one stereo amp per sub and run each VC to one of its 2 channels.

Personally I contacted them and purchased a unadvertised B-Stock 15" D2 which gives me a net of 4 ohms which. They may still have some of those lying around. When I bought mine a couple months back they had like 30 in stock I think...

Anyway good luck! I am hoping to get my Mini Marty built by the end of August!
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post #7 of 12 Old 08-07-14, 10:22 AM
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Re: Ported 3.6cuft 12" to..4.3cuft 15" worth it??

2ohm's on a pro audio amp is fine. Not hard at all. It will tax your wall power point more but thats about it. You wont be pushing your sub as hard as a pro audio setup.

"Music is the space between the notes"
[T]o talk well and eloquently is a very great art, but that an equally great one is to know the right moment to stop.
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post #8 of 12 Old 08-07-14, 11:10 AM Thread Starter
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Re: Ported 3.6cuft 12" to..4.3cuft 15" worth it??

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EndersShadow wrote: View Post
You could still use the mini marty design, you just will give up a few db. But honestly whats 4" in the scheme of things? The Mini Marty is a 24x24x24 cube. I am building my version downfiring so I am adding 3" to the bottom for legs.

Also you are aware that the 15" Stereo Integrity Drivers are dual 4 ohms, meaning you either need 600 wpc @ 8 ohms, or 600 wpc @ 2 ohms..... The 2 ohm load can be a bit hard for pro amps to drive and finding that much wattage @ 8 ohms is marvelous fun. Or you would just need one stereo amp per sub and run each VC to one of its 2 channels.

Personally I contacted them and purchased a unadvertised B-Stock 15" D2 which gives me a net of 4 ohms which. They may still have some of those lying around. When I bought mine a couple months back they had like 30 in stock I think...

Anyway good luck! I am hoping to get my Mini Marty built by the end of August!
I will be building 4 D4 subs in total and use a Inuke 6000dsp,, (2 subs wired parallel) on each channel @4 ohm

Just need help modeling the 20W x24H x25D SUB with a Slot Port design for optimum Performance ?..should be around (4.4cuft) Net,after Port ,braces and driver.

Last edited by randyc1; 08-07-14 at 12:26 PM.
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post #9 of 12 Old 08-07-14, 02:31 PM
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Re: Ported 3.6cuft 12" to..4.3cuft 15" worth it??

Quote:
randyc1 wrote: View Post
I will be building 4 D4 subs in total and use a Inuke 6000dsp,, (2 subs wired parallel) on each channel @4 ohm

Just need help modeling the 20W x24H x25D SUB with a Slot Port design for optimum Performance ?..should be around (4.4cuft) Net,after Port ,braces and driver.
Gotcha. Jealous your gonna run 4 of em lol...

I tried to get my wife to let me do 2 but that was a no go....
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post #10 of 12 Old 08-08-14, 03:09 PM Thread Starter
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Re: Ported 3.6cuft 12" to..4.3cuft 15" worth it??

Quote:
chrapladm wrote: View Post
DO you want to use a slot port, Or passive radiators or round ports?

PR's and slot port would be easiest. PR 's are the easiest but cost more. If tuning low, such as 22hz, you will need a long port length. You will probably end up with something closer to 4cuft after fitting in the port in the enclosure. Then it will be a matter of selecting the correct size to keep velocity of the air down.

Lots of variables but after you select your driver to use then you can go from there.
How is the Best Tuning determined ?? ,.. if i have 4 subs could the tuning be lowered and still have high SPL ?

Does it depend on the Fs of the driver ??
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